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UNDERGROUND GONDUIT. No. 411,595. Patented Sept. 24, 1889.

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DAVID M. HYLAND, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO JOHN P. BARRETT, OF SAME PLACE.

UNDERGROUND CONDUIT.

SPECIFICATION forming part of Letters Patent No. 411,595, dated September 24, 1889.

Application filed March 1, 1889. Serial No. 301,611. (No model.)

To all whom it Hwy concern: It will be understood that the tunnel or Be it known that I, DAVID M. HYLAND, a conduit a is laid from some main conduit of citizen of the United States, residing at Ohithe system, and is designed to carry the neocago, in the county of Cook and State of Illiessary conductors b for a given building.

nois, have invented a certain new and useful This conduit a opens into the chamber or Improvement in Underground Conduit-s for apartment 0. A door may be provided, as Electric Conductors, (Case 1,) of which the shown, so that entrance may be had to the following is a full, clear, concise, and exact chamber. The cables I) are carried through description, reference being had to the accomthe walls or sides of the chamber in any con- IO panying drawings, formingapartof this specivenient manner, all spaces about the cables fication. as they pass through the walls being made My invention relates to systems of under practically air-tight, so that there may be no ground-conduits for electric Wires, and its obescape of into the building. I provide an ject is to provide for removing from such conopening cl tiom tlie chamber to the outside I 5 duits any harmful gases that maybe present. air, a suitable grate and screen being placed As is well-known, when cablesas, for eX- therein for reasons well understood. I proample, those provided with a sheathing of vide also a vent e, which connects with a flue leadare laid in conduits in cities the lead is leading, preferably, to the top of the buildsometimes attacked by the chemical action of ing. This flue is preferably one of a stack of 20 gases which are found present, especially in chimneys, so that it maybe heated, thus causcities. Illuminating-gas, as well as acetic ing a strong draft of air through the chamber, acid and other compounds usually included as indicated by the arrows in Fig. 2. Any under the general name of sewer-gas,l1ave gas which may enter the chamber will thus often caused trouble, in addition to damagbe carried off through the flue. The gas in 2 5 ing the cables, by getting into buildings with the conduits is also caused to circulate, and which the conduits are necessarily connected. dangers from explosions throughout the sys- My invention generally, then, comprises a tem, as well as in the building, are avoided, means of relieving the undergroLind-conduits while at the same time any annoyance from from all objectionable gases, whether harmsmall quantities of gas entering the building 0 ful to the cables or dangerous or objectionis prevented. It is of importance to cause able" when introduced into buildings. the gases throughout the system of conduits My invention consists, speaking generally, to circulate, since they are usually of such in a chamber at the end of a cable, tunnel, specific gravity that ventilation at the manor conduitentering a building, through the holes does not have the desired effect.

3 5 side or walls of which the cables are carried I have described my invention as applied for distribution, this chamber being'provided to one special conduit leading from the main with an air-inlet and a vent connected with a system to a special building. There will be fine, and so arranged that all objectionable many such special conduits in the system, and gases coming through the tunnel will be car- I preferablyprovide each with my apparatus,

40 ried off through the fine without being disthus more eifectually preventing the gases 9o seminated through the building. from remaining in the conduits.

My invention is illustrated in the accompa- Hy invention has been applied to the Chinying drawings, in whichcago system of underground conduits, and

Figure 1 is a plan showing the end of a conhas been found not only to prevent the eX- 45 duit connected with the chamber, the electric plosions in the building for which it is specables carried through one of the walls of the cially designed, but also to be beneficial chamber, and the air inlet and outlet. Fig. 2 throughout the system, since no explosions is a vertical sectional view thereof. have taken place at the man-holes or at other Like parts are indicated by similar letters buildings connected with the same system 50 of reference throughout the different figures. since my invention was applied at one buildunderground conduit extending to a building, of a chamber closed to the building, into which chamber the conduit opens, said chamber being provided with an inlet to the out side air and an outlet leading to a flue, substantially as and for the purpose specified.

2. l The combination, with the conduit a, containing electric conductors, of the chamber a, with which said conduit is connected, said chamber being provided with an opening (1 to the outside air, and an outlet 6, connected with a heated flue, substantially as and for the purpose specified.

, In witness whereof I hereunto subscribe my 2 5 name this 26th day of February, A. D. 1889.

DAVID M. HYLAND.

Witnesses:

GEORGE P. BARTON, ELLA EDLER. 

